Zobrazeno 1 - 10
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pro vyhledávání: '"Zwicky, A."'
Anomalous parity violation in four dimensions would be significant for phenomenology (baryogenesis, gravitational waves) and mathematical physics. Over the past decade, there has been a controversy in the literature as to whether free Weyl fermions g
Externí odkaz:
http://arxiv.org/abs/2411.00571
Autor:
Rowe, Matthew, Zwicky, Roman
Based on explicitly gauge invariant interpolating operators we compute complete next-leading order QED-corrections for leptonic decays. These are sizeable since the helicity-suppression in V-A interactions allows for structure-dependent collinear log
Externí odkaz:
http://arxiv.org/abs/2404.07648
Autor:
Zwicky, Roman
Following previous work we further explore the possibility that the chirally broken phase of gauge theories admits an infrared fixed point interpretation. The slope of the $\beta$ function, $\beta'_*$, is found to vanish at the infrared fixed point w
Externí odkaz:
http://arxiv.org/abs/2312.13761
We derive constraints on the four dimensional energy-momentum tensor from gravitational and gauge anomalies. Our work can be considered an extension of Duff's analysis [1] to include parity-odd terms and explicit symmetry breaking. The constraints im
Externí odkaz:
http://arxiv.org/abs/2312.13222
Autor:
Shifman, Mikhail, Zwicky, Roman
In this note we show that $\beta'_*$, the $\beta$-function slopes in the electric and magnetic theories are equal at the corresponding infrared fixed points. This follows from the scaling of the correlators of the trace of the energy momentum tensors
Externí odkaz:
http://arxiv.org/abs/2310.16449
Publikováno v:
JHEP 12 (2023) 064
We compute the trace, diffeomorphism and Lorentz anomalies of a free Weyl fermion in a gravitational background field by path integral methods. This is achieved by regularising the variation of the determinant of the Weyl operator building on earlier
Externí odkaz:
http://arxiv.org/abs/2309.08670
Autor:
Zwicky, Roman
The free scalar field is only conformally invariant when non-minimally coupled to gravity. In flat space this amounts to amending, or improving, the energy momentum tensor. A no-go theorem prohibits the improvement for Goldstone bosons, originating f
Externí odkaz:
http://arxiv.org/abs/2306.12914
Autor:
Zwicky, Roman
The possibility that gauge theories with chiral symmetry breaking below the conformal window exhibit an infrared fixed point is explored. With this assumption three aspects of pion physics are reproduced if the the quark mass anomalous dimension at t
Externí odkaz:
http://arxiv.org/abs/2306.06752
Autor:
Matthew Rowe, Roman Zwicky
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 7, Pp 1-39 (2024)
Abstract Based on explicitly gauge invariant interpolating operators we compute complete next-leading order QED-corrections for leptonic decays. These are sizeable since the helicity-suppression in V-A interactions allows for structure-dependent coll
Externí odkaz:
https://doaj.org/article/87a11c0edc4d4b89a49955e825597b2c
Autor:
Rowe, Matthew, Zwicky, Roman
We compute the electromagnetic mass difference for the $B$-, $D$- and $K$-mesons using QCD sum rules with double dispersion relations. For the $B$- and $D$-mesons we also compute the linear quark mass correction, whereas for the $K$ the standard soft
Externí odkaz:
http://arxiv.org/abs/2301.04972